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US20100002424A1 - Led lamp tube with heat distributed uniformly - Google Patents

Led lamp tube with heat distributed uniformly Download PDF

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Publication number
US20100002424A1
US20100002424A1 US12/166,552 US16655208A US2010002424A1 US 20100002424 A1 US20100002424 A1 US 20100002424A1 US 16655208 A US16655208 A US 16655208A US 2010002424 A1 US2010002424 A1 US 2010002424A1
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US
United States
Prior art keywords
led lamp
circuit board
portions
control unit
tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
US12/166,552
Other versions
US8092043B2 (en
Inventor
Kuo-Len Lin
Chen-Hsiang Lin
Wen-Jung Liu
Hwai-Ming Wang
Ken Hsu
Chih-Hung Cheng
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kitagawa Holdings LLC
Original Assignee
CpuMate Inc
Golden Sun News Techniques Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CpuMate Inc, Golden Sun News Techniques Co Ltd filed Critical CpuMate Inc
Priority to US12/166,552 priority Critical patent/US8092043B2/en
Assigned to CPUMATE INC., GOLDEN SUN NEWS TECHNIQUES CO.,LTD. reassignment CPUMATE INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHENG, CHIH-HUNG, HSU, KEN, LIN, CHEN-HSIANG, LIN, KUO-LEN, LIU, WEN-JUNG, WANG, HWAI-MING
Publication of US20100002424A1 publication Critical patent/US20100002424A1/en
Application granted granted Critical
Publication of US8092043B2 publication Critical patent/US8092043B2/en
Assigned to KITAGAWA HOLDINGS, LLC reassignment KITAGAWA HOLDINGS, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CPUMATE INC., GOLDEN SUN NEWS TECHNIQUES CO., LTD.
Active legal-status Critical Current
Adjusted expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/14—Structural association of two or more printed circuits
    • H05K1/141—One or more single auxiliary printed circuits mounted on a main printed circuit, e.g. modules, adapters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F21K9/27—Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes
    • F21K9/278—Arrangement or mounting of circuit elements integrated in the light source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/003—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
    • F21V23/004—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array arranged on a substrate, e.g. a printed circuit board
    • F21V23/006—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array arranged on a substrate, e.g. a printed circuit board the substrate being distinct from the light source holder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/19—Details of hybrid assemblies other than the semiconductor or other solid state devices to be connected
    • H01L2924/191—Disposition
    • H01L2924/19101—Disposition of discrete passive components
    • H01L2924/19107—Disposition of discrete passive components off-chip wires
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10007—Types of components
    • H05K2201/1003—Non-printed inductor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10007—Types of components
    • H05K2201/10106—Light emitting diode [LED]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10227—Other objects, e.g. metallic pieces
    • H05K2201/10287—Metal wires as connectors or conductors
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/22—Secondary treatment of printed circuits
    • H05K3/222—Completing of printed circuits by adding non-printed jumper connections
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S362/00—Illumination
    • Y10S362/80—Light emitting diode

Definitions

  • the present invention relates to a lamp tube, and in particular to a LED lamp tube for replacing a fluorescent lamp.
  • the conventional LED lamp tube has a glass-made tube 1 a and a LED lamp assembly 2 a .
  • the LED lamp assembly 2 a comprises a circuit board 20 a disposed horizontally and transversely in the tube 1 a .
  • a plurality LED lamps 21 a i.e. light-emitting diodes
  • the upwardly-facing surface is provided with a circuit control unit 22 a for converting into currents and voltages suitable for the light-emitting diodes.
  • both ends of the tube 1 a are provided with a conductive cap 10 a and are electrically connected with the circuit board 20 a respectively.
  • a LED lamp tube having a plurality of light-emitting diodes is formed, thereby replacing traditional florescent lamps.
  • the circuit control unit 22 a is arranged on one side of the circuit board 20 a . That is to say, the circuit control unit is concentrated on one end of the tube 1 a while the other end is not provided with any other electronic elements.
  • the performance of the LED lamp tube and a neighboring LED lamp 21 a may be affected because the heat is concentrated on the same side of the circuit board 20 a . Even, a portion of the LED lamp 21 a may suffer damage prematurely due to poor heat-dissipating effect. As a result, the whole LED lamp tube has to be replaced. Thus, the lifetime of the LED lamp tube is reduced a lot, which also results in the waste of unburned LED lamp 21 a.
  • the Inventor proposes the present invention based on his expert knowledge and elaborate researches in order to solve the problems of prior art.
  • the present invention is to provide a LED lamp tube with heat distributed uniformly.
  • the respective electronic elements electrically connected on the circuit board are arranged uniformly, so that the heat generated by the electronic elements will not concentrate on one side or the same position of the circuit board.
  • the heat within the LED lamp tube can be distributed uniformly, thereby lowering the temperature and facilitating the heat dissipation.
  • the present invention is to provide a LED lamp tube with heat distributed uniformly, which includes a hollow transparent tube, a LED lamp assembly disposed in the transparent tube, two conductive caps provided on both ends of the transparent tube respectively, and a circuit control unit.
  • the structure of the circuit control unit is constituted of a plurality of separated sub-portions. The respective sub-portions of the circuit control unit are distributed uniformly on the circuit board of the LED lamp assembly.
  • FIG. 1 is a cross-sectional view showing a conventional LED lamp tube
  • FIG. 2 is a perspective view showing the first embodiment of the present invention
  • FIG. 3 is a cross-sectional view showing the first embodiment of the present invention.
  • FIG. 4 is a cross-sectional view showing the second embodiment of the present invention.
  • FIGS. 2 and 3 are a perspective view and a cross-sectional view showing the first embodiment of the present invention respectively.
  • the present invention is to provide a LED lamp tube with heat distributed uniformly, which includes a transparent tube 1 , a LED lamp assembly 2 , two conductive caps 3 , and a circuit control unit 4 .
  • the transparent tube 1 is a hollow elongate tube with two open ends.
  • the transparent tube 1 is made of light-transmitting materials for receiving the LED lamp assembly 2 and the circuit control unit 4 .
  • the LED lamp assembly 2 comprises a circuit board 20 horizontally arranged in the transparent tube 1 , and a plurality of LED lamps 21 arranged on the downwardly-facing surface of the circuit board 20 , as shown in FIG. 3 .
  • the LED lamps 21 are light-emitting diodes that are arranged on the circuit board 20 and are accommodated in the transparent tube 1 together with the circuit board 20 .
  • the LED lamps 21 illuminate a side peripheral wall surface of the transparent tube 1 .
  • the two conductive caps 3 are mounted on both open ends of the transparent tube 1 and are electrically connected to the circuit board 20 of the LED lamp assembly 2 respectively, so that the LED lamp assembly 2 can be provided with necessary electricity via the two conductive caps 3 .
  • the primary characteristic of the present invention lies in that the structure of the circuit control unit 4 is constituted of a plurality of separated sub-portions 40 .
  • Each of the sub-portions 40 comprises a control circuit 400 and a transforming element 401 provided on the circuit board 400 for converting currents and voltages suitable for each LED lamp 21 .
  • the respective sub-portions 40 can be electrically connected with each other via a lead 41 , thereby electrically integrating with the circuit board 20 of the LED lamp assembly 2 .
  • the electrical function of the circuit control unit 4 has been achieved by integrating these sub-portions 40 , but its whole structure is separated into respective sub-portions 40 .
  • the circuit control unit 4 is separated into two sub-portions 40 , and these two sub-portions are arranged on two ends of the circuit board 20 of the LED lamp assembly 2 adjacent to the transparent tube 1 . Since the respective sub-portions 40 of the circuit control unit 4 are distributed uniformly on the circuit board 20 of the LED lamp assembly 2 . In this way, when the LED lamp tube is in use, although the circuit control unit 4 generates heat, the heat can be still uniformly distributed on the circuit board 20 to dissipate the heat.
  • the heat will not be concentrated on the same side or the same position, so that the LED lamp 21 on this position will not be overheated to suffer damage prematurely.
  • the temperature within the LED lamp tube can be lowered, thereby facilitating the heat-dissipating effect.
  • the circuit board control unit 4 is divided into three sub-portions 40 , thereby arranging the circuit control unit 4 more uniformly. Therefore, the number of the sub-portions 40 divided from the circuit control unit 4 is determined based on the number of actual heated points of the LED lamp tube, and thus the number of sub-portions is not limited to two or three.
  • the LED lamp tube with heat distributed uniformly can be obtained.
  • the present invention really achieves the desired objects and solves the drawbacks of prior art. Further, the present invention indeed has novelty and inventive steps, and thus conforms to the requirements for a utility model patent.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

A LED lamp tube which includes a hollow transparent tube, a LED lamp assembly disposed in the transparent tube, two conductive caps provided on both ends of the transparent tube respectively, and a circuit control unit. The circuit control unit includes a plurality of separated sub-portions. The respective sub-portions of the circuit control unit are distributed uniformly on the circuit board of the LED lamp assembly. Via the uniform arrangement of respective sub-portions of the circuit control unit, the heat within the LED lamp tube can be distributed uniformly, thereby lowering the temperature and facilitating the heat dissipation.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The present invention relates to a lamp tube, and in particular to a LED lamp tube for replacing a fluorescent lamp.
  • 2. Description of Prior Art
  • As shown in FIG. 1, the conventional LED lamp tube has a glass-made tube 1 a and a LED lamp assembly 2 a. The LED lamp assembly 2 a comprises a circuit board 20 a disposed horizontally and transversely in the tube 1 a. On the downwardly-facing surface of the circuit board 20 a is provided with a plurality LED lamps 21 a (i.e. light-emitting diodes), while the upwardly-facing surface is provided with a circuit control unit 22 a for converting into currents and voltages suitable for the light-emitting diodes. Further, both ends of the tube 1 a are provided with a conductive cap 10 a and are electrically connected with the circuit board 20 a respectively. Via the above arrangement, a LED lamp tube having a plurality of light-emitting diodes is formed, thereby replacing traditional florescent lamps.
  • However, with regard to the arrangement of electronic elements in the above-mentioned LED lamp, the circuit control unit 22 a is arranged on one side of the circuit board 20 a. That is to say, the circuit control unit is concentrated on one end of the tube 1 a while the other end is not provided with any other electronic elements. Although such an arrangement facilitates the integration of electronic elements, in practice, the performance of the LED lamp tube and a neighboring LED lamp 21 a may be affected because the heat is concentrated on the same side of the circuit board 20 a. Even, a portion of the LED lamp 21 a may suffer damage prematurely due to poor heat-dissipating effect. As a result, the whole LED lamp tube has to be replaced. Thus, the lifetime of the LED lamp tube is reduced a lot, which also results in the waste of unburned LED lamp 21 a.
  • In view of the above drawbacks, the Inventor proposes the present invention based on his expert knowledge and elaborate researches in order to solve the problems of prior art.
    • SUMMARY OF THE INVENTION
  • The present invention is to provide a LED lamp tube with heat distributed uniformly. In view of the heat distribution of each LED lamp in the LED lamp tube, the respective electronic elements electrically connected on the circuit board are arranged uniformly, so that the heat generated by the electronic elements will not concentrate on one side or the same position of the circuit board. Thus, the heat within the LED lamp tube can be distributed uniformly, thereby lowering the temperature and facilitating the heat dissipation.
  • The present invention is to provide a LED lamp tube with heat distributed uniformly, which includes a hollow transparent tube, a LED lamp assembly disposed in the transparent tube, two conductive caps provided on both ends of the transparent tube respectively, and a circuit control unit. The structure of the circuit control unit is constituted of a plurality of separated sub-portions. The respective sub-portions of the circuit control unit are distributed uniformly on the circuit board of the LED lamp assembly.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a cross-sectional view showing a conventional LED lamp tube;
  • FIG. 2 is a perspective view showing the first embodiment of the present invention;
  • FIG. 3 is a cross-sectional view showing the first embodiment of the present invention; and
  • FIG. 4 is a cross-sectional view showing the second embodiment of the present invention.
    •  DETAILED DESCRIPTION OF THE INVENTION
  • In order to make the Examiner to better understand the characteristics and technical contents of the present invention, a detailed description relating thereto will be made with reference to the accompanying drawings. However, the drawings are illustrative only, but not used to limit the present invention.
  • Please refer to FIGS. 2 and 3, which are a perspective view and a cross-sectional view showing the first embodiment of the present invention respectively. The present invention is to provide a LED lamp tube with heat distributed uniformly, which includes a transparent tube 1, a LED lamp assembly 2, two conductive caps 3, and a circuit control unit 4.
  • The transparent tube 1 is a hollow elongate tube with two open ends. The transparent tube 1 is made of light-transmitting materials for receiving the LED lamp assembly 2 and the circuit control unit 4.
  • The LED lamp assembly 2 comprises a circuit board 20 horizontally arranged in the transparent tube 1, and a plurality of LED lamps 21 arranged on the downwardly-facing surface of the circuit board 20, as shown in FIG. 3. The LED lamps 21 are light-emitting diodes that are arranged on the circuit board 20 and are accommodated in the transparent tube 1 together with the circuit board 20. The LED lamps 21 illuminate a side peripheral wall surface of the transparent tube 1.
  • The two conductive caps 3 are mounted on both open ends of the transparent tube 1 and are electrically connected to the circuit board 20 of the LED lamp assembly 2 respectively, so that the LED lamp assembly 2 can be provided with necessary electricity via the two conductive caps 3.
  • The primary characteristic of the present invention lies in that the structure of the circuit control unit 4 is constituted of a plurality of separated sub-portions 40. Each of the sub-portions 40 comprises a control circuit 400 and a transforming element 401 provided on the circuit board 400 for converting currents and voltages suitable for each LED lamp 21. Furthermore, the respective sub-portions 40 can be electrically connected with each other via a lead 41, thereby electrically integrating with the circuit board 20 of the LED lamp assembly 2.
  • The electrical function of the circuit control unit 4 has been achieved by integrating these sub-portions 40, but its whole structure is separated into respective sub-portions 40. In the present embodiment, the circuit control unit 4 is separated into two sub-portions 40, and these two sub-portions are arranged on two ends of the circuit board 20 of the LED lamp assembly 2 adjacent to the transparent tube 1. Since the respective sub-portions 40 of the circuit control unit 4 are distributed uniformly on the circuit board 20 of the LED lamp assembly 2. In this way, when the LED lamp tube is in use, although the circuit control unit 4 generates heat, the heat can be still uniformly distributed on the circuit board 20 to dissipate the heat. The heat will not be concentrated on the same side or the same position, so that the LED lamp 21 on this position will not be overheated to suffer damage prematurely. In addition, with the heat distributed uniformly, the temperature within the LED lamp tube can be lowered, thereby facilitating the heat-dissipating effect.
  • Furthermore, as shown in FIG. 4, in the second embodiment of the present invention, the circuit board control unit 4 is divided into three sub-portions 40, thereby arranging the circuit control unit 4 more uniformly. Therefore, the number of the sub-portions 40 divided from the circuit control unit 4 is determined based on the number of actual heated points of the LED lamp tube, and thus the number of sub-portions is not limited to two or three.
  • Therefore, via the above constitution, the LED lamp tube with heat distributed uniformly can be obtained.
  • According to the above, the present invention really achieves the desired objects and solves the drawbacks of prior art. Further, the present invention indeed has novelty and inventive steps, and thus conforms to the requirements for a utility model patent.
  • Although the present invention has been described with reference to the foregoing preferred embodiments, it will be understood that the invention is not limited to the details thereof. Various equivalent variations and modifications can still occur to those skilled in this art in view of the teachings of the present invention. Thus, all such variations and equivalent modifications are also embraced within the scope of the invention as defined in the appended claims.

Claims (6)

1. A LED lamp tube, comprising:
a transparent tube formed into a hollow elongate tube with both open ends;
a LED lamp assembly having a circuit board disposed in the transparent tube and a plurality of LED lamps disposed on the circuit board;
two conductive caps provided on both open ends of the transparent tube and electrically connected with the circuit board of the LED lamp assembly respectively; and
a circuit control unit electrically connected on the circuit board of the LED lamp assembly;
wherein the circuit board unit includes a plurality of separated sub-portions distributed uniformly on the circuit board of the LED lamp assembly.
2. The LED lamp tube according to claim 1, wherein each of the sub-portions of the circuit control unit comprises a control circuit board and a transforming element provided in the control circuit board.
3. The LED lamp tube with heat distributed uniformly according to claim 2, wherein the respective sub-portions of the circuit control unit are electrically connected with each other via a lead.
4. The LED lamp tube with heat distributed uniformly according to claim 2, wherein each of the sub-portions of the circuit control unit is electrically connected to the circuit board of the LED lamp assembly, so that the sub-portions are electrically integrated via the circuit board.
5. The LED lamp tube with heat distributed uniformly according to claim 1, wherein the respective sub-portions of the circuit control unit are electrically connected with each other via a lead.
6. The LED lamp tube with heat distributed uniformly according to claim 2, wherein each of the sub-portions of the circuit control unit is electrically connected to the circuit board of the LED lamp assembly, so that the sub-portions are electrically integrated via the circuit board.
US12/166,552 2008-07-02 2008-07-02 LED lamp tube with heat distributed uniformly Active 2029-06-07 US8092043B2 (en)

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US20130127338A1 (en) * 2011-11-22 2013-05-23 Cheng-Ming Lee Drive Circuit Structure for LED Lamp Tube
US9521727B1 (en) 2014-05-30 2016-12-13 Cooper Technologies Company Lighting fixture with motion sensor and battery test switch
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